linux-kernel - [PATCH 4/4] x86: Merge load_gs

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Date:   Fri, 25 Mar 2022 11:39:53 -0400
From:   Brian Gerst <brgerst@...il.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Brian Gerst <brgerst@...il.com>
Subject: [PATCH 4/4] x86: Merge load_gs_index()

Merge the 32- and 64-bit implementations of load_gs_index().

Signed-off-by: Brian Gerst <brgerst@...il.com>
---
 arch/x86/include/asm/segment.h       | 7 -------
 arch/x86/include/asm/special_insns.h | 7 ++++---
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/segment.h b/arch/x86/include/asm/segment.h
index 617b3663e4dd..2e7890dd58a4 100644
--- a/arch/x86/include/asm/segment.h
+++ b/arch/x86/include/asm/segment.h
@@ -350,13 +350,6 @@ static inline void __loadsegment_fs(unsigned short value)
 #define savesegment(seg, value)				\
 	asm("mov %%" #seg ",%0":"=r" (value) : : "memory")
 
-/*
- * x86-32 user GS accessors.  This is ugly and could do with some cleaning up.
- */
-#ifdef CONFIG_X86_32
-# define load_gs_index(v)		loadsegment(gs, (v))
-#endif	/* X86_32 */
-
 #endif /* !__ASSEMBLY__ */
 #endif /* __KERNEL__ */
 
diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index 68c257a3de0d..45b18eb94fa1 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -184,14 +184,15 @@ static inline void wbinvd(void)
 	native_wbinvd();
 }
 
-#ifdef CONFIG_X86_64
 
 static inline void load_gs_index(unsigned int selector)
 {
+#ifdef CONFIG_X86_64
 	native_load_gs_index(selector);
-}
-
+#else
+	loadsegment(gs, selector);
 #endif
+}
 
 #endif /* CONFIG_PARAVIRT_XXL */
 
-- 
2.35.1